High‐Quality 0D Cs₄PbBr₆‐Based Dense Wafer for High‐Sensitivity X‐Ray Detection and High‐Resolution Imaging in Harsh Environment

Abstract

The use of metal halides promotes the development of X‐ray detectors (XDs) owing to their excellent X‐ray absorbance, electrically benign defects, and large mobility−lifetime (µτ) product. Yet the severe baseline drift, size limitation, large dark current, and mediocre stability are still waiting to be solved. Herein, high density size‐scalable Cs4PbBr6 wafer‐based XD is constructed by the hot isostatic‐pressed method for the first time. Meanwhile, different Br− vacancy (VBr) concentration‐based Cs4PbBr6 is realized. The role of VBr in electrical structure and charge transport is highlighted by density functional theory and experimental measurement. Moreover, the further study points the 0D structure endows Cs4PbBr6 with high activation energy for ionic transport (1044 meV) and bandgap (3.88 eV), which finally results in an ultra‐stable baseline and thermal stability. On the basis of efficient response (7068 µC Gyair−1 cm−2), reliable current output, ultra‐low detection limit (1.75 nGyair s−1), high spatial resolution (5.2 lp mm−1 at modulation transfer function = 0.2), fast response speed and radiation stabilities (>1000 Gyair), the high‐resolution X‐ray images under broad energy range (20–160 keV) are realized on both single‐pixel and linear scanning mode, thus holding huge potential for medical diagnosis, safety inspection, and outer space detection.

Sensitive and Stable Ruddlesden–Popper Perovskite X-ray Detectors via Defect Passivation

“…Thus, higher resistivity and weaker ion migration of the PVK + ABN sample are good for abating noise current in X-ray detectors, thereby benefiting a low LoD. The lower LoD of the ABN device can significantly reduce the risks associated with X-ray exposure by decreasing the required X-ray dose in radiation tests. – …”

Dopant-compensated Cs2AgBiBr6−xClx single crystals for photo-imaging and X-ray detection

“…The photoconductivity curves can be fitted using the modified Hecht equation. 48,49 The modified Hecht equation is as follows:…”

Sequential Vacuum Evaporated Copper Metal Halides for Scalable, Flexible, and Dynamic X‐Ray Detection

“…In addition, the most important thing is that these materials have low toxicity and can achieve green, environmentally friendly development. [27][28][29][30][31][32] The optical and physical properties mentioned above correspond to the needs of scintillators, making them very promising in the field of scintillators.…”